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System Dynamic SimulatingModeling is one of the most appropriate and successful scientific dynamics modeling methods of the complex, non -linear, natural, technical and organizational systems. The methodology of this method, together with use of digital computer, showed its efficiency in practice as very suitable means for solving the problems of management, of behavior, of sensibility, of flexibility of behavior dynamics of very complex systems. All this is made by computer simulating, i.e. "in laboratory", which mean without any danger for observed realities.The paper deals with dynamic analysis of automatic ship steering gear systems utilizing complex controls that function according to the principle of proportional, integral and derivation regulators. The analysis involves a system dynamic simulation modeling methodology as one of the most suitable and effective means of dynamic modeling of complex non-linear, natural, organizational and technical systems. The paper discusses system dynamics simulation models being used in qualitative (mental-verbal, structural) and quantitative (mathematical and computer) simulation models on ships equipped with trailing steering systems and PID regulator. Authors suggest using the presented models for designing and constructing new steering systems, for diagnosing existing constructions and for education in Universities.

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Port is place of interlace of different kindle of cargo, and play important role in shipping process, connecting different type of traffic in one united system, and form interrupted traffic chain. The aim of this paper is: to show the efficiency of System Dynamics Simulation Modeling during the study of the dynamics behavior of the Port-Transshipment system, and to find optimal solution for transshipment with regard to type of the cargo and size of traffic of the cargo, direction and dynamics of arriving and shipping the cargo. The System Dynamics Modeling is in essence special, i.e. "holistic" approach to the simulation of the dynamics behavior of natural, technical and organization systems, and it contains quantitative and qualitative Simulation Modeling of various natured realities. The concept of optimization in System Dynamics is based on belief that the "manual and iterative" procedure, i.e. optimization by the method "retry and error" can be successfully executed using "heuristic optimization" algorithm, with the help of digital computer, and in complete coordination with System Dynamics Simulation Methodology.